make time out of string

I have a database filled with 24 hr clock times in string format.
9:00 12:13 17:42 you get the picture.
Is there an easy way to get the time between 9:00 and 17:42
I can think of ways to split the string around the colon and then figure the elapsed time, but is there and easy way of doing it? Obviously one can't subtract, because of the silly 60 minutes.

If you put null in the expression, compiler says null is not defined, use system.dbnull which if you do compiler says type system can not be used in expression.
Null was defined in the old Vb, why not now?

okay almost got it to work.
anytime greater than 12:00 give the invalid datetime error again.
if I change all times to less than 12 then everything is okay.
So it still does not understand Military time, 24 hr clock

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